单项选择题

When Jane fell off the bike, the other children ______ .

A．were not able to help laughter
B．could not help but laugh
C．could not help to laughing
D．could not help to laugh
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单项选择题
Let's ask him for help, ______
A．don't we
B．shall we
C．have we
D．haven't we
单项选择题
Those shirts are very expensive. Do you know ______
A．how much cost him
B．what do they cost
C．they cost how much
D．how much they cost
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